Transmission for vehicle

Abstract

A transmission for a vehicle includes a transmission unit for receiving a transmission command for a vehicle, a driving unit for generating a driving force for switching a posture of the transmission unit, and a control device for controlling the driving unit to switch the posture of the transmission unit based on whether a preset condition is satisfied. The driving unit includes a first stator for generating magnetic flux, a first rotor having a first inner permanent magnet and a second inner permanent magnet axially arranged at a predetermined spacing along a rotation axis, and configured to be rotated by the magnetic flux transferred to the first inner permanent magnet, an outer permanent magnet, and a second rotor configured to rotate along a magnetic force path between the second inner permanent magnet and the outer permanent magnet.

What is claimed is: 
     
       1. A transmission for a vehicle, comprising:
 a transmission unit for receiving a transmission command for a vehicle; 
 a driving unit for generating a driving force for switching a posture of the transmission unit; and 
 a controller configured to cause the driving unit to switch the posture of the transmission unit based on whether a preset condition is satisfied, 
 wherein the driving unit comprises:
 a first stator for generating magnetic flux; 
 a first rotor including a first inner permanent magnet and a second inner permanent magnet, wherein the first inner permanent magnet and the second inner permanent magnet are disposed axially with a predetermined axial spacing therebetween along a rotation axis, the first rotor being configured to be rotated by the magnetic flux transferred to the first inner permanent magnet; 
 an outer permanent magnet provided in a number different from a number of the second inner permanent magnet; and 
 a second rotor configured to rotate along a magnetic force path between the second inner permanent magnet and the outer permanent magnet at a number of revolutions per unit time that is different from a number of revolutions per unit time of the first rotor. 
 
 
     
     
       2. The transmission of  claim 1 , wherein the controller is configured to control the driving unit to cause the transmission unit to be switched to a parking position in response to a parking condition being satisfied. 
     
     
       3. The transmission of  claim 1 , wherein the control device controller is configured to control the driving unit to cause the transmission unit to be switched to a stow position in response to a stow condition being satisfied. 
     
     
       4. The transmission of  claim 1 , wherein, in response to the transmission unit being switched from a position corresponding to a first transmission stage to a position corresponding to a second transmission stage while a transmission condition is not satisfied, the controller is configured to control the driving unit to cause the transmission unit to be switched to the position corresponding to the first transmission stage. 
     
     
       5. The transmission of  claim 1 , wherein the second rotor comprises:
 a base; and 
 a plurality of pole pieces, each of which extends in one direction from an edge of the base. 
 
     
     
       6. The transmission of  claim 5 , wherein the plurality of pole pieces are arranged between the second inner permanent magnet and the outer permanent magnet, and form the magnetic force path between the second inner permanent magnet and the outer permanent magnet. 
     
     
       7. The transmission of  claim 1 , wherein the second rotor rotates in a stepwise manner in response to a force greater than a magnetic force between the second inner permanent magnet and the outer permanent magnet being exerted on the second rotor. 
     
     
       8. The transmission of  claim 7 , wherein the second rotor rotates in the stepwise manner with an articulation having a distance between adjacent pole pieces or a distance between adjacent outer permanent magnets. 
     
     
       9. The transmission of  claim 1 , wherein the second rotor rotates in a stepwise manner to generate a sense of operation in the transmission unit in response to a force greater than a magnetic force between the second inner permanent magnet and the outer permanent magnet being exerted on the second rotor. 
     
     
       10. The transmission of  claim 1 , wherein the transmission unit and the driving unit exchange forces with each other via a driving force transferring unit. 
     
     
       11. The transmission of  claim 10 , wherein the driving force transferring unit includes a belt. 
     
     
       12. The transmission of  claim 10 , wherein the driving force transferring unit comprises:
 a wire; 
 a driving pulley rotatable by a driving force of the driving unit, wherein the wire is wound around an outer circumferential surface of the driving pulley; and 
 a driven pulley rotatable by switching the posture of the transmission unit, 
 wherein a rotational force is exchanged between the driving pulley and the driven pulley via the wire. 
 
     
     
       13. The transmission of  claim 12 , wherein the driving force transferring unit further comprises a wire fixing unit for fixing the wire to the driven pulley, and
 wherein a tension of the wire is adjustable depending on a coupling depth of the wire fixing unit into the driven pulley. 
 
     
     
       14. The transmission of  claim 13 , wherein the wire fixing unit comprises a hollow lumen, through which the wire passes,
 wherein a wire fixing pin is fixedly coupled to the wire at an end of the wire that passes through the hollow lumen, and 
 wherein the wire fixing unit is coupled to the driven pulley while pressing the wire fixing pin. 
 
     
     
       15. The transmission of  claim 12 , wherein a portion of the wire wound on the driving pulley includes a slip preventing pin fixedly coupled to the wire, and
 wherein the driving pulley includes a receiving groove for accommodating the slip preventing pin therein. 
 
     
     
       16. The transmission of  claim 1 , wherein the transmission unit and the driving unit are directly coupled to each other to exchange power. 
     
     
       17. The transmission of  claim 16 , wherein the transmission unit is directly coupled to a spindle of the driving unit. 
     
     
       18. A transmission for a vehicle, comprising:
 a transmission unit for receiving a transmission command for a vehicle; and 
 a driving unit for generating a driving force for switching a posture of the transmission unit based on whether a preset condition is satisfied, 
 wherein the driving unit comprises:
 a first stator for generating magnetic flux; 
 a first rotor including a first inner permanent magnet and a second inner permanent magnet axially arranged with a predetermined axial spacing therebetween along a rotation axis, and configured to be rotated by the magnetic flux transferred to the first inner permanent magnet; 
 an outer permanent magnet provided in a number different from a number of the second inner permanent magnet; and 
 a second rotor configured to rotate along a magnetic force path between the second inner permanent magnet and the outer permanent magnet at a number of revolutions per unit time that is different from a number of revolutions per unit time of the first rotor, 
 
 wherein the driving force transferring unit comprises:
 a wire; 
 a driving pulley rotatable by a driving force of the driving unit, wherein the wire is wound around an outer circumferential surface of the driving pulley; and 
 a driven pulley rotatable by switching the posture of the transmission unit, and wherein a rotational force is exchanged between the driving pulley and the driven pulley via the wire. 
 
 
     
     
       19. The transmission of  claim 18 , wherein the driving force transferring unit further comprises a wire fixing unit for fixing the wire to the driven pulley,
 wherein a tension of the wire is adjustable depending on a coupling depth of the wire fixing unit into the driven pulley, 
 wherein the wire fixing unit comprises a hollow lumen, through which the wire passes, 
 wherein a wire fixing pin is fixedly coupled to the wire at an end of the wire that passes through the hollow lumen, and 
 wherein the wire fixing unit is coupled to the driven pulley while pressing the wire fixing pin. 
 
     
     
       20. The transmission of  claim 18 , wherein a portion of the wire wound on the driving pulley includes a slip preventing pin fixedly coupled to the wire, and
 wherein the driving pulley includes a receiving groove for accommodating the slip preventing pin therein.